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 A167578 The third column of the ED3 array A167572 4
 1, 17, 183, 2043, 26529, 398025, 6765975, 128556675, 2699661825, 62092533825, 1552309291575, 41912411683275, 1215458905032225, 37679245697871225, 1243414695550433175, 43519523831289457875, 1610222144582102522625 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA a(n) = (1/4)*(-1)^(n)*(2*n-7)!!*((8*n^4-20*n^3-22*n^2+55*n+12)+(32*n^5-80*n^4-80*n^3+200*n^2+18*n-45)*(sum((-1)^(k+n)/(2*k+1),k=0..n-1))) CROSSREFS Equals the third column of the ED3 array A167572. Other columns are A167576 and A167577. Cf. A007509 and A025547 (the sum((-1)^(k+n)/(2*k+1), k=0..n-1) factor). Sequence in context: A066521 A055904 A116964 * A181401 A025958 A199674 Adjacent sequences:  A167575 A167576 A167577 * A167579 A167580 A167581 KEYWORD easy,nonn AUTHOR Johannes W. Meijer, Nov 10 2009 STATUS approved

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